In advance, yes, I know this is ridiculous etc. Now that that’s over with...

I’d like to try a variation on tubes-rolling-in-trays processing. Part of this involves a simple tube design I’ve thought about for a long time - picture a regular open tube but slightly barrel shaped (bowed out) instead of straight.

Since this would not be a daylight process (I don’t care if I’m in the dark), I’ve thought of a few ways of making (more like cobbling together) these myself. However that limits me in a few ways, including materials, so I’m wondering if I can outsource it.

Can anybody recommend a good machine/fabrication shop that could make something like this, either out of a plastic, or perhaps stainless? I have a few places so far, but really I have zero experience with this sort of thing.

Thanks